Actually gaff where I was going with the radio station question was this...
At my undergrad we were told that our college radio stations liscense to broadcast covered the entire school not just the station itself because of how it was purchased...therefor we were able to play liscensed music during our shows.
Is this a crock? Probably but I don't know I never took the time to truely check into it.
DJ's now are also getting around a lot of the copyright/
ASCAP/BMI buisness with the various editing and "smashups" they're doing as "derivitive work." But you're right they should be paying the fees....
We've got a large collection of effects/music here but as for the royalty free I'll have to look around a bit...